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SubjectRe: [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing kfree
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On Mon, 2009-08-03 at 17:11 +0800, Julia Lawall wrote:
> From: Julia Lawall <julia@diku.dk>
>
> Move orthogonal error handling code up before a kzalloc, so that it
> doesn't have to free the allocated data.

Acked-by: Zhu Yi <yi.zhu@intel.com>

Thanks,
-yi

> The semantic match that finds the problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
>
> // <smpl>
> @r exists@
> local idexpression x;
> statement S;
> expression E;
> identifier f,f1,l;
> position p1,p2;
> expression *ptr != NULL;
> @@
>
> x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
> ...
> if (x == NULL) S
> <... when != x
> when != if (...) { <+...x...+> }
> (
> x->f1 = E
> |
> (x->f1 == NULL || ...)
> |
> f(...,x->f1,...)
> )
> ...>
> (
> return \(0\|<+...x...+>\|ptr\);
> |
> return@p2 ...;
> )
>
> @script:python@
> p1 << r.p1;
> p2 << r.p2;
> @@
>
> print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
> // </smpl>
>
> Signed-off-by: Julia Lawall <julia@diku.dk>
> ---
> drivers/net/wireless/iwlwifi/iwl-debugfs.c | 12 ++++++------
> 1 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> index 7707a26..6748a3f 100644
> --- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> +++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
> @@ -310,18 +310,18 @@ static ssize_t iwl_dbgfs_nvm_read(struct file *file,
> return -ENODATA;
> }
>
> + ptr = priv->eeprom;
> + if (!ptr) {
> + IWL_ERR(priv, "Invalid EEPROM/OTP memory\n");
> + return -ENOMEM;
> + }
> +
> /* 4 characters for byte 0xYY */
> buf = kzalloc(buf_size, GFP_KERNEL);
> if (!buf) {
> IWL_ERR(priv, "Can not allocate Buffer\n");
> return -ENOMEM;
> }
> -
> - ptr = priv->eeprom;
> - if (!ptr) {
> - IWL_ERR(priv, "Invalid EEPROM/OTP memory\n");
> - return -ENOMEM;
> - }
> pos += scnprintf(buf + pos, buf_size - pos, "NVM Type: %s\n",
> (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
> ? "OTP" : "EEPROM");



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